The Freudenberg-NOK SZ495 O-Ring, designed to meet AS568-343 specifications, offers an inner diameter of 3-3/4" and an outer diameter of 4-1/8", with a cross-section of 3/16". This O-Ring is engineered from high-performance materials, ensuring excellent sealing in hydraulic and pneumatic applications. Its robust design provides superior resistance to oils, fuels, and chemicals, making it suitable for various industrial environments. The SZ495 is a reliable choice for engineers seeking a compliant and durable sealing solution.